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Boundary Layer Instabilities

#0029


Research of hydrodynamic instabilities and turbulent mixing for optimization of laser target compression.

Tech Area / Field

  • PHY-PLS/Plasma Physics/Physics

Status
8 Project completed

Registration date
28.02.1993

Completion date
27.12.1998

Senior Project Manager
Ryabeva E V

Leading Institute
FIAN Lebedev, Russia, Moscow

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov
  • Institute of Mathematical Modelling, Russia, Moscow
  • Krzhizhanovsky Energetics Institute, Russia, Moscow

Collaborators

  • AWE, UK, Aldermaston
  • Osaka University / Institute of Laser Engineering, Japan, Osaka
  • Rochester University / Institute of Laser Energetics, USA, NY, Rochester

Project summary

The project has three goals. The first one is to find new understanding of the classical phenomena of the hydrodynamical instabilities and turbulent mixing by taking into account applications to the ICF problem. We need to include in the consideration: a dependence of the turbulent mixing region on the initial conditions of an instability; a real three-dimensional behavior of the physical processes in the laser plasma and compressed matter; the criteria of a transition from unstable perturbation growth to the mixing region formation; a real initial condition of the compression non-uniformity and possibility to improve it; and several more physical characteristics.

The second goal of the project is to redirect some part of military research in Russian institutions (in Arzamas-16 and others) to civil purposes, which is a very important problem today.

The third goal is to prepare real base for international cooperation which could help to solve the problem of ICF fundamental physics, and to find out the simplest and cheapest ways to a demonstration experiment of ignition and burning (mainly, for a direct-drive compression). The Project proposed could be a necessary step in that direction, and could turn out to be of immense benefit to the sides concerned: Russia, US, Japan.

The Institutes involved in the Project have a large experience in this field of research. Lebedev Physics Institute has been for a long time dealing with laser microfusion, laser diagnostics, computer codes, hydrodynamic instability and mixing in ICF. In cooperation with ENIN there nave been obtained the important results on an initial stage of turbulence, the effect of initial conditions and the development of three-dimensional perturbations. The ENIN has a good experimental base, the pioneer results have been obtained, particularly on measurement of 3D perturbations. VNIIEP is the leading organization in the problems of hydrodynamic instability. The technology of initial perturbation in a gelatin layer developed in the Laboratory of Dr. Meshkov is very promising for a research of 3D-perturbations of a complex spectrum and mode combination. A shock tube developed in VNIIEP extends the range of experiments on shock tubes. Calculation and simulation of laser target processes are carried out at IMM, the new computer codes have been devised. The participation of foreign partners (ILE-Japan, LLE-USA) will provide the performance of laser experiments on large laser facilities (such as GEKKO-XII, Omega, 1-beam experiment) at high and controllable quality of the laser radiation. Besides, various types of computer codes and laser diagnostic approaches have been developed and used in ILE and LLE.

The main part of the project will be completed within the period of three years (36 months, 1993-1995). The extension of the project time duration beyond this period depends on the restricted number of the complicated laser compression experiments that could be done on Gekko XII laser of ILE (Osaka), and a possibility of the experiment at LLE (Rochester), and it is not changed the cost of this Project.


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